As concrete examples, try to get a copy of Disney’s 1946 movie, “Song of the South.” It’s been removed from circulation because of its whitewashed presentation of “happy slaves.” Similarly, 6 of Dr. Seuss’ books, including “And to Think That I Saw It on Mulberry Street” were withdrawn because of racial imagery (the mentioned book had a “Chinaman” drawn with a WWII stereotype style - rice hat, sloping eyes, buck teeth).